Pet Food Inc. has two product lines: Cat food and Dog food, Contribution margin income statement data for the most recent year follow: Assuming total fixed costs remain unchanged, how would discontinuing the Dog food line affect operating income? A. Increase in total operating income of $7,000 B. Decrease in total operating income of $45,000 C. Decrease in total operating income of $407,000 D. Increase in total operating income of $181,000